Version scope: these detailed mechanics and route prerequisites come from classic-game community documentation. Story-route pages contain spoilers. Compare your edition before a route-sensitive choice.

Isoroku Yamamoto official portrait
How do I enter the Isoroku route and avoid campaign traps? ©ALICESOFT. Official Japanese-release image; not a Steam playtest screenshot. · Source

Confirm the intended branch — route spoilers

Isoroku must be in the roster and her required personal event must be complete. The source names the entry command Searched for Kou but.... Having her as an archer alone does not fulfill the relationship-event requirement.

The community walkthrough says the entry can still be available while Kou is missing, but warns that Isoroku's second Kou-related event must have happened beforehand. A first-game save does not offer this IF-route choice.

Finish Kou-dependent tasks before entry

After entering this route, commands needing Kouhime's presence can no longer be completed. Review planned dungeon discoveries and character clears before committing to the branch.

Before entryWhy it matters
Isoroku's required eventsThey are part of the route condition, not optional archer upgrades.
Kou-dependent tasksTheir missing character cannot be restored by extra affection items.
Roster and capacityLow-priority recruit events can be delayed by a busy story queue.
Defensive frontsSeveral remaining clans can become active around the transition.

Do not follow the True route's map ending

The Monster Army behaves differently here. The source warns that ordinary conquest near its final provinces can cause it to seize provinces back, and taking Morocco does not simply open the True route's endgame.

Follow the route's Isoroku and Miki events instead. The reference says Miki must be found before completion; the relevant sequence depends on Isoroku's progress and the Battleship Nagato campaign state.

Watch the one-fan warning phase

A later story sequence can reduce your turns to one Action Fan. The documented countermeasure is Suzume's mind-reading event for Isoroku; ignoring the sequence can lead to a fatal outcome. Keep a pre-transition save and read the active purple events instead of treating the reduced fan count as a permanent economy mechanic.

This article deliberately avoids retelling every mature scene or promising a numbered-turn script. Use action fans for normal rules and army preparation for the multiple fronts. The route instructions are classic-version references with translated event-name limits.

Sources & version scope

Source review: 2026-10-06. Official images are credited to Alicesoft. Editorial recommendations are separate from documented mechanics.